/*
 ******************************************************************************
 *  Java Signal Framework for routing java objects. 
 *  Copyright (C) 2008  Manuel Stahl (thymythos@web.de)
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public
 *  License along with this library; if not, write to the Free
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 ****************************************************************************** 
 */
package org.tru42.signal.processors.generator;

import org.tru42.signal.lang.SObject;

/**
 * Generates a time stamp on every period.
 * @author Manuel Stahl
 *
 */
public class Timer extends SObject {

	private final Thread thread;

	private int period = 0;

	private final Runnable task = new Runnable() {
		@Override
		public void run() {
			while(true) {
				while(period == 0)
					try {
						Thread.sleep(100000);
					} catch (InterruptedException e1) {}
					
				while(period != 0)
					try {
						time(System.currentTimeMillis());
						Thread.sleep(period);
					} catch (InterruptedException e) { }
			}
		}
	};
	
	public Timer() {
		super();
		thread = new Thread(task);
		thread.start();
	}
	
	@org.tru42.signal.lang.annotation.Signal
	public void time(long timestamp) {
		trigger("time", timestamp);
	}
	
	@org.tru42.signal.lang.annotation.Sink
	public void period(long timestamp, Integer value) {
		period = value.intValue();
		thread.interrupt();
	}
	
}
